Explanation:
To create a sonata from supernovae, first you have to
find the supernovae.
To do that composers Alex Parker and Melissa Graham
relied on the
Canada France
Hawaii Telescope (CFHT) Legacy Survey
data of four deep fields on the sky
monitored from April 2003 through August 2006,
adopting 241 Type Ia supernovae.
Enchanting to
cosmologists,
Type Ia
supernovae are
thermonuclear explosions that destroy white dwarf stars.
Then, they gave each supernova a note to play,
the volume of the note determined by the distance to the supernova.
Fainter, more distant supernovae play quieter notes.
Each note's pitch was based on a
stretch factor
measured by how fast the supernova brightens and fades over time
relative to a standard time history.
Higher stretch factors play higher notes in
pitches drawn from the illustrated
Phrygian
dominant scale.
Of course, each supernova note is played on an instrument.
Supernovae in massive galaxies were assigned to a stand-up bass, while
supernovae in less massive galaxies played their note on a grand piano.
Click on the image or follow these links
(Vimeo,
YouTube)
to watch a time compressed animation of the CFHT Legacy Survey data
while listening to the Supernova Sonata.